Porphyra head removing machine and head removing method

The invention relates to a porphyra head removing machine and a head removing method. The porphyra head removing machine comprises a rack, a rotating shaft rotationally connected to the rack, a power device connected with the rotating shaft and driving the same to rotate, and more than one cutter spindles distributed on the rotating shaft along a rotating shaft circumferential direction and with the rotating shaft as a center ring, wherein an included angle of 0 to 45 degrees is formed between an axis of each cutter spindle and the rotating shaft; and spiral projected lines radially projecting and spirally extending along an axial direction are arranged on the surface of each cutter spindle. Porphyra heads on a fiber rope can be thoroughly removed via the spiral projected lines arranged on the cutter spindles and the fiber rope cannot be damaged; besides, the included angle of 0 to 45 degrees formed between the axis of each cutter spindle and the rotating shaft can disperse force bearing points of the cutter